Machine for relieving fluted tools.



PATENTED JUNE 23, 1903.

y I. G. EGHYO'LS. MACHINE? FOR RELIEVING PLUTED TOOLS.

APPLICATION FILED OUT. 10, 1902.

5 SHEETS-$311131 1..

K0 MODEL;

Inventor; Francis GEchoZs:

By his Jifiorneys:

Witnesses:

No. 731,873. PATENTED JUNE 23, 1903.

F. G. EGHOLS. MACHINE FOR RELIEVING FLUTED TOOLS.

APP LIOATION FILED OUT. 10, 1902.

N0 MODEL. 5 SHEETS-SHEET 2.

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PATENTED JUNE 23,1903

, v F. GQBcfioLs. MACHINE FOR RELIE'VING PLUTED TOOLS.

APPLIOATION PILED- our. 10, '1902.

5 SHEETS-SHEET 3..

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PATENTED JUNE 23, 1903 F. G. EGHOLS. MAGHINEIFOR RELIEVING PLUTED TOOLS.

APPLIUATIOH PILEP OUT. 10. 1902'.

6 SHEETS-SHEET 4.

H0 MODEL.

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No. 731,873 PATENTED JUNE 23, 1903.

' v "F. G. EUHOLS.

MACHINE FOR RELIBVING FLUTED TOOLS. APPLICATION FILED 001210. 1902, noMODEL.

5 SHEETS-SHEET 5.

W1Zna95es: [0106mm Frazvcz' 8.5021013.

N... 731573; I Patented M523, 190s. UNITED STATES PATENT OFFICE.

FRANCIS e. EOHOLS, OF HARTFORD, CONNECTICUT, ASSIGNOR To PRATT &

,WHITNEY COMPANY, or HARTFORD, CONNECTICUT, A CCRP R TICN OF NEW JERSEY.j r

MACHINE FOR RELIEVING -FI '.UTED Toots.

SPECIFICATION forming part of Letters Patent N o. 7 31,873, dated'J'une23, 1903.

' Application filed October 10, 1902. (Serial No. 126,705. .(No model.)

To aZZ whom it may concern: direction of the arrow. Fig. 11 is a side619- t Be it known that I, FRANCIS GFEOHOLS, a vation of the tail-stockand its attached parts. I citizen; of the United States, residing atHart- Fig. 12 is a detail viewin elevation of part of ford, in thecounty of Hartford and State of ,themeans for actuating the pawl forprevent- Connecticut, have invented certain new and ing-over indexing ofthe work.

useful Improvements in Machines for Reliev-l like numerals designatesimilar parts 5: ing Fluted Tools, of which the following is athroughout the several views. specification. Referring to the drawings,the numeral 5 My invention relates to machines for redesignatesframework of any desired design IO lieving fluted tools, such asreamers, taps, and construction; 6, a carriage mounted for &c.; and ithas for its object the provision of reciprocatory movement by anysuitable 6o improved means for accomplishing this remeans upon saidframework; 7, a bed-plate sult expeditiously and with precision,whereadjustable in an arcnate path 'upon said carby tools of any desiredsize may be accurately riage; 8, bolts passing through slotted flangesx5 relieved and all products of the machine will of the bed-plate; 9, ahead-stock, and a o In the-accompanyin 3 5 stock with certain partsinielevation; Fig. adjacent to the head-stock 9 andeccentric 18 be ofstandard quality. tail -stock, mounted for adjustment toward 6 p Afurther object of the invention is the and from each other on. thebed-plate in a provision of improved means for oscillating: weltknownway. the work in such away that the various ribs Designated by thenumeral 11 is a rotary or lands thereof will be brought into contool,shown as a grinding-disk, although other tact with the relieving-tool,such action taksuitable tools maybe substituted therefor, 70 ing placeduringfia rec'iprocationpfeither the said tool being-supported by ashaft 12, jourcarriage or said workwith {relation to each naledinbearings ofastandard'13of the frame other. g x --j a jand-driven"by-abelt 14:, as illustrated in A further objectof theinvention is the pro- "Fig. 1.

vision of improved-means for indexing or Mountedin bearings of the headand tail 7; turning the toolstep by step until all of .its stocks is ashaft-1.5, carrying'a pulley 16, and lands have beengreliVed-by-thegrindingthijs shaft is shown provided with a longitudisk orother instrumentalityiemployed. 'd in'al groove for the reception ofkeys, by

gdrawings, Figure l is which eccentrics 17 and 18 are connected to aside elevation of gzny improved machine. said shaft with a feasibilityof adjustment 8o Fig. 2 is a perspectiveviewof the head-stock lengthwisethereof to accord with the posiand parts carried thereby. Fig. 3 is ahorition of the head and tail stocksuponthe bedzontal section of theupper-part of the headplate, eccentric 17 being securedito the shaft lis a detail in section of the valve-chamber, adjacent to tail-stock 10.

the valve being in:-elevation.w. Fig: 5 is a sec- Mounted in thehead-stock 9is a shaft 19, tionaldetailoftheface-.platehereinaftermenthe bore in which said shaft. is fittedjbeingtioncd. Fig.6 isa longitudinal vertical secclosed at its rear end by acap 20, as shown tion of thepiston, piston-chamber, and adjain Fig. 3,and keyed or otherwise connected cent parts, taken on line a: w of Fig.2. Fig. to the forward end of said shaftisahead 21, o 7 is a sectionaldetail'view showing the pawl to which the strap 22 of eccentric 17 isarticur and its carrierin elevationand the ratchet- .lated, asillustrated in Fig. 2. In its front wheel on the face-platebjrdottedlines, Fig. end this head is provided with a guideway 45. 8 isaperspective view of the rear side of the 23,,jshown as of dovetailshape, in which is face-plate. v Fig. 9 is a front end elevation offitted an extension 24 of similar form,project- 5 j the tail-stock withthe shaft carrying the ec= ing from the rear part ofahead 25. Said headcentrics in section. Fig. 10 is a transverse 25 is chambered at 25 andhas a forwardly- 1 "section on line 11 y of Fig. 3 looking in theprojecting circumferential flange 25 Seafter stated.

cured to and projecting from the base of the chamber is a stud or shortshaft 26, shaped at its projecting end as a conecenter 26', andsurrounding this stud is a sleeve 27, having keyed thereto a plate 28,carrying a pawl 29, said plate and pawl being located within the flange25 and the pawl being pressed to its work by aspring 30, as shown inFigs. 3 and 7.

Loosely mounted upon the shaft26 is a faceplate 31, having agroovedperiphery 31, and secured to or formed integral with the faceplate andlocated on its inner sideis a ratchetwheel 32. At its projecting end theshaft 26 is threaded just rear of the cone to receive a nut 33, whichholds the face-plate in position, the nut being prevented-from turningby a screw 33', threaded into the shaft and said nut, as shown in-Fig.3.

Rigid with sleeve 27 is a gear 34, and projecting from the head 25 is acasing 35, having perforated lugs 35' for a purpose herein- Locatedwithin this casing is a piston-chamber 36, held in place by a threadedsleeve 37 at one'end, said sleeve engaging a complemental thread 35 andthe sleeve having a flanged head 37 with acentral opening 37 for thereception of a rod 38, having a roughened head 38. Abutting against thelower end of the piston-chamber is a flanged cap 39, having a port 39',and secured to a flanged end of the casing 35 is a plate 40, having anozzle 40' in alinenient with the port 39, said nozzle receiving the endof a flexible tube 41, leading to a valve-chamber 42. (Illustrated inFigs. 1 and 4 and hereinafter described.)

Surrounding the threaded rod 38 is a spiral spring 43, hearing at oneend against the under side of the closed end of sleeve 37 and receivedat its opposite extremity and for a por-' tion of its length in a hollowpiston 44, located within the piston-chamber 36 and havin; a closed end44, as illustrated in Fig. 6.

Fitted for sliding movement in the perforated lugs 35' of casing 35 is arod 45, having an enlargement 45 with a lateral extension 45 saidextension being provided with a bore 45 for the reception of the screw38. Surrounding the rod 45 and hearing at one end against a collar 45thereon and at the opposite end against the inner side of one of thelugs 35' is a spiral spring 46, which normally tends to throw the rod tothe position shown in Fig. 6 with its enlarged head against the upperside of one of the lugs 35. Pivoted at 47 to the flange of the casing 35is an anglelever 48, one of the ends of which is articulated to the rod45 and the other end of which is connected to a long rod 49.

For adjusting and accurately determining Projecting from the casing is ablock 53, having a concaved inner surface 53, the arc of curvature ofwhich is eccentric to that of the grooved periphery of the face-plate31, and located in a groove of said face-plate 31 is a ball 54, normallyretained in the position represented in Fig. 5 by a pin 55, projectingfrom a spring 56, carried by said block 53, as

illustrated in Figs. 2 and 5. With this construction the f ace-plate ispermitted partially to rotate for indexing purposes in but onedirection, that of the arrow in Fig. 5, for should by any cause anattempt be made to turn it So in an opposite direction the ball willbind between the inner surface of the block and the periphery of saidface-plate and will prevent such movement.

Projecting from the face-plate are a stud 57 and a spring 58 forreceiving between them the arm of a lathe-dog 59, bifurcated at itsopposite end to straddle the work or tool-blank 60 in a well-knownmanner.

Mounted on the frame is a valve-chamber 9o 42, hereinbefore mentioned,and this valvechamber is closed at its ends by threaded and perforatedcaps 61 and 62, respectively, and is provided with an admission-port 63and with an eduction-port 64. opening leading to the admission-port is aconduit 65, leading to a suitable source of fluid-pressure (notshown)-for instance, a compressed-air tank. Mounted in an opening.communicating with the eduction-port 64 101 is a nipple 66, over whichthe end of the flexible tube 41 is fitted, as represented in said Fig.4.

Mounted within the valve-chamber 42 is a reciprocatory valve 67, havingports 68 and to 69, respectively, communicating with a longitudinalpassage 70 in said valve, the body of the valve being reduced at 71 and72, respectively, to enable communication to be made between theinduction and eduction 11 ports when the valve is shifted longitudinallyof the chamber by means hereinafter described. A spring 73 is fitted inthe valvechamber and normally tends to throw the valve to its closedposition. the figure mentioned.) Connected to the right-hand end of thevalve is a rod 74, which passes through the perforated cap 62 and isattached by a nut or otherwise at itsfree end to a lever 75, pivoted at75 to the bed or 12 frame 5.

In one of its sides the reciprocatory carriage 6 is provided with alongitudinal groove 6, in which are adjustably fitted stop-carriers 76and 77, respectively, provided with adjusti:

able stops 7S and 79, respectively, the stop 78 coming into contact withlever 75 below its pivot upon one reciprocation of the carriage, andthereby shifting the valve to admit fluid to the pipe 41, and the stop79 like- I;

wise contacting with said lever above its pivot when the carriagereciprocates in an opposite direction to again shift the valve in thesame way to admitfluid to said pipe 41. This valve- Fitted within an(Illustrated in l I chamber, the valve, adjustable stops, and piv- .otedlever are fully set forth and described in my contemporaneously-pendingapplications filedAugust 25, 1902, Serial Nos. 120,953 and 120,954, andno claim is made to said features in the present application.

j Journaled in the tail-stock is a shaft 80,

havinga head 81, provided with a groove for the reception of a slide 82,bifurcated at 83 for. the reception of a nut 84 for adjusting a sleeve85, in which is fitted a pump-center 86 for sustaining the rear end ofthe toolblank, all as set forth in my application, Se-

rial No. 120,953, above mentioned.

Designated by 87 is' a bar having a longitudinal slot 87, said bar beingsecured to the head 81 by a screw-bolt 88, this bar being grooved at 89,as shown by dotted lines in Fig. hand by full lines in Fig. 9, so thatits frictional engagement with the head will be reduced. At the forwardend of this bar is a head-90, to which is secured by belts or otherwisea plate 91, having a perforated lug 91, j and a depending extension 92,provided with a lug 92. Fitted in a socket of this lug and M passingthrough the lug 91 is a rock-shaft 93,

having crank-arms 94 95, and depending from the arm 95, to which it issecured by a screw or otherwise, is a stud 96, perforated at 96 toreceive the rod 49, the latter being secured in the perforation 96 by ascrew 97. Articulated to the crank-arm 95 is a rod 98, connect ed at 99to a lever 100,'pivoted to a bracket 101 and carrying a yieldingstop-plate or pawl 102, which is normally thrown to the positionrepresented in Fig. 9 by a spring 103.

For adjusting the slide 82, carrying the center 86, a Vernier 104 andscrew 105 are employed, said devices being duplicates of thosever-screws 108, may be employed, if desired,

as shown in Figs. 3 and 10. 1 My improved machine operates as follows:

Slides 24 and 82 are first set to adjust the centers to the exactpositionrequired and determined by the scales of the verniers, and

i the tool supported by said centers is thereby brought to the locationnecessary for the re lieving operation to take place.

Power is now applied topulley 16 of shaft 15, thereby through eccentrics17 and 18 rocking the heads 21 and 81 and causing the tool-blank to bebrought alternately in and out of contactwith the edge of thegrinding-disk 11 or other relieving-tool employed. Carriage 6 a maybereciprocated by any desired means i (not shown)for instance, by themechanism fully set forth in my application Serial No. 120,953, abovementioned-rand the tool-blank is given alongitudinal "traverse along theedge oftthe grinding-disk, the rocking mo tion of the blank towardtlieedge of the'disk 11 being continuous until all of the lands arerelieved by said disk. As the carriage arrives at the limit of itsmovement toward pressed, and the closed end of said piston finally comesinto contact with the end of rod 38, thereby shifting said rod andcausing it to reciprocate the rod 45, connected to bellcrank lever 48,and this lever as it rocks causes the rod 49 to actuate the rock-shaft93 and through the connections described to oscillate the pivoted leverand momentarily withdraw the pawl 102 from contact with the blank. Asthe carriage starts on its reciprocation toward the right the valve isimmediatelyclosed by spring 73, thus shutting oi the supply of motivefluid to the flexible tube 41, and when this has been accomplished thepiston 44 is immediately forced to its normal position, (shown in Fig.6,) thereby rocking the sleeve 27 and plate 28 in an opposite directionand causing the pawl 29, in engage- 'ment with the ratchet-wheel 32, toturn the face-plate 31 and index the work. i As the piston 44 is forcedto its lower position the rod 45 is simultaneously actuated by spring36. The bell-crank 48 is swung back again, and this action permits thepawl to snap upon the back of the tooth or land just relieved and toengage the next tooth, and thus prevent the blank from turning too farunder the influence of the indexing mechanism. At the limit of thereciprocation of carriage 6 toward the right another land is relieved,and the stop 78 will strike lever 75 below its pivot, and thus cause thevalve to be actuated and the indexing devices to operate in themannerabove described. In this Way uponeach movement of the carriage a land ofthe toolblank Will be relieved. The blank will then be indexed andanother land relieved upon the return reciprocation of the carriage, andso on until all the lands are finished, when theblank will be removed, anew one inserted, and the operation repeated. 1

, By adjusting the bar 87 the pawl 102 may be located at any desiredpoint along the line of the tool-blank, and the head and tail stocks mayalso be adjusted upon the bedplate 7 to set the centers for differentlengths of blanks.

My invention is not limited to the precise details of construction shownanddescribed,

for preventing over-indexing of the blank.

Furthermore, the indexing mechanism may be employed with machines of adifferent character without departure from the invention.

Having thus described my invention, what I claim is 1. The combination,with a reciprocatory carriage, of means for supporting work thereon, andmeans actuated by fluid-pressure in one direction and by spring-pressurein the opposite direction for indexing the work.

2. The combination, with a reciprocatory carriage, of head and tailstocks movable with said carriage; and means actuated by fluid-pressurein one direction and by springpressure for indexing purposes in theopposite direction.

3. The combination, with a reciprocatory carriage, of adjustable headand tail stocks; centers for supporting work carried by said stocks;indexing mechanism; spring-controlled devices for actuating, saidindexing mechanism in a direction for indexing the work; andfluid-pressure devices for actuating it in the opposite direction.

4. The combination, with means for supporting Work, of a piston-chamber;a piston in said chamber; means for supplying'fluid under pressure tosaid piston-chamber; a rack carried by the piston; means for returningthe piston after the supply of fluid has been shut off; and meansactuated by the rack for indexing the work.

5. The combination, with a reciprocatory carriage, of head and tailstocks; shafts mounted for oscillatory movement in said stocks; headscarried by the shafts; centers upon which work is supported mounted inthe heads; a sleeve mounted ina chamber of one of the heads; means foroscillating the sleeve; and means controlled by the sleeve for indexingthe work.

6. The combination, with a support, of a stationary shaft; a sleeve uponsaid shaft; means for actuating the sleeve; and means controlled by thesleeve for indexing the work. v

7. The combination, with a chambered support, of a stationary shaftlocated in the chamber of said support; a sleeve surrounding said shaft;means for actuating the sleeve; and means controlled by the sleeve forindexing work.

. 8. The combination, with a support, of a shaft fixed thereto; a gearedsleeve loose on said shaft; means for oscillating the sleeve; and meanscontrolled by the sleeve for indexing Work.

9. The combination, with a device for supporting work, of a chamberedhead; a shaft constituting one of the work-supporting devices mounted insaid head; a sleeve surrounding said shaft; a gear on said sleeve; arack in engagement with the gear; means for actuating the rack; andindexing mechanism controlled by the sleeve.

10. The combination, with work-supporting devices, of a chambered head;a shaft constituting one of said work-supporting devices keyed in saidhead; a sleeve loose on the shaft; a gear on the sleeve; a plate alsocarried by the sleeve; a pawl carried by the plate; a face plate looseon the shaft; a ratchet-wheel rigid with the face-plate, and with whichthe pawl is in engagement; and means carried by the face-plate forengaging work.

11. The combination, with work-supporting devices, of a chamberedsupport having an extension; a shaft constituting one of thework-supporting devices and mounted in the support; a sleeve loose onthe shaft; a gear carried by the sleeve; a plate also carried by thesleeve; a pawl connected to the plate; a

rack mounted on the extension of the sup-- port and in engagement withthe gear on the sleeve; means for actuating the rack; a faceplate looseon the shaft; aratchet-wheel carried by the face-plate; and means forconnecting the face-plate with the work.

12. The combination, with work-supporting devices, of indexingmechanism; and a device for engaging and thereby preventingover-indexing of the work controlled bya part of said indexingmechanism.

13. The combination, with devices for supporting work, of a movabledevice for engaging said work and preventing over-indexing of said work;and means for connecting said device with an element of the indexingmechanism.

14. The combination, with work-supporting devices, of a pivoted dog forengaging said work and preventing over-indexing of the same; indexingmechanism; and means controlled by an element of said indexing mechanismfor actuating said dog.

15. The combination, with work-supporting devices, of indexingmechanism; devices actuated by fluid-pressure for operating certainelements of said indexing mechanism in one direction; devices actuatedby springpressnre for operating them in the opposite direction; meansfor connecting the elements actuated in the manner set forth with thework; a device for preventing over-indexing of the work; and means foractuating said device. 4

16. The combination, with work-supporting devices, of a chambered head;a shaft projecting from said head, and having acenter; a lathe-dog, andmeans for connecting it with the face-plate; a ratchet-Wheel rigid withthe face-plate; asleeve loosely mounted on the shaft; a gear rigid withthe sleeve; a plate keyed to the sleeve; a pawl carried by the plate,andin engagement with the ratchetwheel; a rack mounted in an extension ofthe head; and means for reciprocating the rack.

17. The combination, with a chambered head, of a shaft projecting fromsaid head; a sleeve loose on the shaft; a gear rigid with the sleeve;aplate keyed to the sleeve; apawl ICC carried by the plate a faceplateloose on the shaft; a ratchet-wheel carried by the faceplate; a casingprojecting from the head, and having a piston-chamber; a piston in saidchamber; means for admitting fluid under pressure to saidpiston-chamber; a spring for returning the piston; and a rack carried bythe piston and in engagement with the gear on the sleeve.

18. The combination, with means for supporting toothed work, of indexingmechanism; and a movable device controlled by an element of saidindexing mechanism, said do- I vice engaging the teeth of the work andpreventing over-indexing of the same.

porting toothed work,ofindexing mechanism;

a movable stop for successively engaging the teeth of the work; andmeans for withdrawing said stop to permit the work to be indexed,

and then returning it so that it'will engage a tooth and thus preventover-indexing.

21. The combination, with head and tail stocks, of centers carried bysaid stocks and upon which the work is supported; indexing mechanism; adevice for preventing overindexing of the work; and means for actuatingsaid device.

22. The combination, with head and tail stocks, of work-supportingcenters carried by said head and tail stocks; a face-plate mount edononeof said stocks; means for connecting the face-plate with the work;means for turning said face-plate to index the work; and devicescontrolled by the means for turning the face-plate, for preventingover-indexing of said face-plate.

23. The combination, with a reciprocatory carriage, of head and tailstocks; work-supporting centers carried by said stocks a faceplateloosely mounted on one of the centers; mechanism for indexing theface-plate; a device for preventing over-indexing of the work; and meanscontrolled by the indexing mechanism for actuating said device.

24. The combination, with head and tail stocks, ofwork-supportingcenters carried by said stocks; a face-plate looselymounted on one of the centers; means for connecting said face-plate withthe work; pawl mechanism for actuating the face-plate; means foractuating the pawl mechanism; a device for preventing over-indexing ofthe work; and connections from said device to an element of the plate; arack; means for actuating the rack;

gearing connecting the pawl -andratchet mechanism and rack; and meansfor connecting the face-plate with work to be indexed.

26. The combination, witha face-plate, of means for turning the same inone direction; and means comprising a ball and a device against which itbears for preventing reverse movement of said faceplate.

27. The combination, with a face-plate, of means for intermittinglyrotating said face plate; a concave block; and a ball betweensaid blockand face-plate.

28. The combination, with a face-plate having a grooved periphery, of aball running in the groove; a stationary concave block;-

means for preventing the escape of the ball; and means forintermittingly rotating the face-plate.

29. The combination, with aface-plate having a grooved periphery, ofmeans for intermittingly rotating said face-plate; a stationary, concaveblock; a ball between the block and face-plate; and a spring-controlledpin for preventing escape of the ball.

30. The combination, with a face-plate having a grooved periphery, ofmeans for intermittingly rotating said face-plate; a stationary blockhaving a concave face the arc of which is eccentric to the periphery ofthe face-plate; a ball between said block and faceplate; and means forpreventingescape of the of the face-plate; and a spring-controlled pinfor preventing escape of the ball.

32. The combination, with indexing mechanism, of a face-plate having agroovedperiphery; a stationary block having a concave face eccentric tothe periphery of the faceplate; a ball located between the face-plateand block; a pin; and a spring secured to the block and carrying saidpin.

33. The combination, with a shaft, of a head secured to said shaft; acarrier adjustably fitted in one end of the head; a center carried bysaid carrier; a sleeve loosely mounted on the center; a plate keyed tothe sleeve; a face-plate loose on the center; a ratchet-wheel carried bysaid face-plate; a pawl adapted to engage the teeth of saidratchet-wheel, and carried by the plate keyed to the-sleeve; a gear onthe sleeve; a rack for actuating said gear; a spring for actuating saidrack in one direction; and means operated by fluid-pressure foroperating the rack in an opposite direction.

34:. The combination, withachambered carrier, of a center locatedtherein; a sleeve loose on the center; a gear carried by the sleeve; aplate keyed to the sleeve; a face-plate also loose on the center; aratchet-wheel mounted on the face-plate; a pawl carried by the plate; apiston movable in an extension of the carrier; means for actuating saidpiston in one direction by fluid-pressure; and a spring for returningthe piston.

35. The combination, with a chambered carrier having an extension, of acenter mounted in the chamber of said carrier; a sleeve loose on thecenter; a gear carried by the sleeve; a plate keyed to the sleeve; apawl carried by said plate; a face-plate loose on the center; aratchet-Wheel carried by the face-plate; a hollow piston mounted in theextension of the carrier; a piston-chamber; means for supplying fluidunder pressure to said pistonchamber; and a spring bearing against thehead of the piston-chamber and the piston.

36. The combination, with a carrier, of indexing mechanism supported onsaid carrier; a sleeve constituting a part of said indexing mechanism; agear carried by the sleeve; a rack mounted in an extension of thecarrier, and the teeth of which are in engagement with said gear; apiston-chamber; a piston in said chamber; means for supplying fluidunder pressure to the piston-chamber; adevice for preventingover-indexing of the work; and means controlled by the piston foractuating said device.

37. The combination, with indexing mechanism, ola carrierfor saidmechanism having an extension; a piston-chamber located in theextension; a piston within the piston-chamber; a rod movably mounted onthe extension; means intermediate the piston and said rod, whereby therod is actuatedby said piston; a device for preventing over-indexing ofthe work; and means connecting the rod and said device.

38. The combination, with means for supporting work, of indexingmechanism; means for actuating said mechanism; a pivoted lever; devicesfor connecting said lever with an element of the means for actuating theindexing mechanism; a movably-mounted device for preventingover-indexing of the work;

and means controlled by the pivoted lever for actuating said device.

39. The combination, with means for supporting work, of indexingmechanism; a piston-chamber; a piston in said chamber; means forsupplying fluid under pressure to the piston-chamber; a spring forreturningthe piston; a rack carried by the piston; a threaded rod; adevice connected to said rod; a pivoted lever; a rod actuated by saidlover; a pivoted device for preventing over-indexing of the work; andmeans connecting the rod actuated by the pivoted lever with said device.

40. The combination, with head and tail stocks, of shafts mountedtherein; means for simultaneously oscillating said shafts; heads carriedby each of the shafts; slides mounted in gnideways of the heads; meansfor adjusting the slides; centers carried by the slides; a face-plateloosely mounted on the headstock center; means for indexing thefaceplate; a device carried by the tail-stock for preventingover-indexing of the work; and means controlled by an element oftheindexing means for actuating said device.

41. In a machine for relieving fluted tools,

the combination, with a reciprocatory carriage, of head and tail stocksmovable with said carriage; a rotary shaft journaled in said stocks;eccentrics carried by said shaft and located outside of the head andtailstocks; shafts mounted in the head and tail stocks; eccentricstrapsconnected to said shafts; heads carried by the shafts; Work-supportingdevices carried by said heads; and means for indexing the Work mountedon one of the heads.

In testimony whereof I affix my signature in presence of two witnesses.

FRANCIS G. EOHOLS. Witnesses:

E. D. QLARK; W. W. LARKUM.

